Help me solve this problem

0.0002 x 0.004

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart